阅读理解

　　Is the world warming up? According to many reports the answer is yes．Eleven of the hottest years since 1850 appeared between 1995 and 2006．Last year, the United Nation’s Intergovernmental Panel on Climate Change(IPCC)reported the earth was about 0.75℃warmer than it was in 1850．While this doesn’t sound like a lot, a small difference in average(平均)temperature can make a big difference in climate(气候)．During the last ice age, the planet was only about five degrees colder than now．

　　It’s all about the speed at which temperatures are changing．In the past, temperatures moved up or down step by step．But in the 20^th century, especially since 1976, temperatures have likely risen more quickly than during any century in the last 1,000 years．Warming may bring improved harvests(收获)to northern countries such as Canada and Russia．However, many species(物种)won’t like these conditions．They begin moving towards cooler places and cause lots of trouble to human world．

　　The IPCC reported that human activity is very likely responsible(负责任的), by increasing the greenhouse effect(效应)．Some gases cause the air to take in heat energy．Without the greenhouse effect, the earth’s average temperature would be -18℃ rather than the present comfortable 14.6 degrees．The main greenhouse gases are carbon dioxide(CO₂), water vapor(蒸汽)and some other gases．Burning oil, coal and waste adds to the Carbon dioxide, and it has increased 35％since 1850．

　　Many researchers have found that natural forces alone don’t explain the temperature increases over the last 30 to 40 years．Their study shows that as carbon dioxide goes up, temperatures will rise too．But some scientists don’t agree．They think the effect of human produced greenhouse gases is very small compared to the normal changes that the climate causes．

　　When asked whether humans are causing the world warming, Carl Wunsch, a professor at the Massachusetts Institute of Technology says,“It seems very likely from what I’ve seen．Is it 100％sure?No．There’s something to do with natural changes．”Does that mean we should have a“wait and see”attitude(态度)?Not according to Wunsch．He points out we buy house insurance(保险)not because we are sure our homes will be on fire, but because it’s a danger we’d rather avoid．

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阅读下面的五篇短文，根据短文内容，从短文后各题所给的A、B、C、D四个选项中，选择最佳选项。

　　Volunteering means spending some of your free time helping others．You may volunteer to help other people, but you can also volunteer to protect animals, the environment, or any other things that you care about．

　　Volunteering helps others, but it can also help you．If you’re worried about something that's happened, doing something can be a great way to deal with(处理)your feelings．

　　Volunteering can let you see your own life in new ways．Sometimes it's easy to worry about things like grades or get angry because you don't have the most expensive shoes or the newest computer game．Volunteering lets you spend some time on others for a while．

　　Lots of people find that they really enjoy volunteering．Volunteer experiences often put you in a different environment．Doing volunteer work means one very important thing： You make a difference in the world．

　　Volunteering is a great way to have fun with your family, and here are some ideaas on how you can do together．

　　●Clean up a park, or a road along a river．

　　●Plant trees or flowers in your community(社区)

　　●Serve food at a homeless shelter(收容所)

　　●Give meals to people who are elderly or ill at home．

　　●Clean up a school or other public buildings．

　　Some schools now require(要求)kids to spend some of their time on service to others．Volunteering gives kids a taste of responsibility, because people are depending on them for something important．Volunteering also can help kids learn important things about themselves．A volunteer job can even help some kids decide what they want to do when they grow up．So what are you waiting for? Make a plan to start volunteering today!

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完形填空

　　John loved basketball．One day, as he was walking to a basketball game, he dreamed about playing basketball for the college team the next year．Suddenly a car hit him and he was thrown three meters 　　1　　．

　　John woke up in a hospital room．When the doctor told him that both his legs were broken, he knew his college basketball 　　2　　 was over．John did what the doctors told him, but it 　　3　　．When he left the hospital, John was sent to a rehab center(康复中心)．

　　A week 　　4　　 he arrived there, he met Sunny Chen．Sunny used to be a coach(教练)．His legs were badly hurt in a skating accident．

　　Though he couldn't move his legs, Sunny became the coach of a basketball team called the Suns．It was an on-wheelchair basketball team, because 　　5　　 on the team played from a wheelchair(轮椅)．Sunny invited John to 　　6　　 the game．John played badly, but for the 　　7　　 time since the accident．he stopped feeling sorry for himself．

　　After becoming a part of the Suns．John improved quickly．Basketball was like medicine for him．John was much 　　8　　 than before．When John became unhappy, Sunny was there to comfort him．The day before John 　　9　　 the center, he had dinner with Sunny．He asked Sunny how he could be so happy even with his broken legs．

　　Sunny 　　10　　 and said, "It's really quite easy．When you keep your face to the sun．the shadows will fall behind．"

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